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Water- and oil repellent substrate and method of treatment

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US5804252A
US5804252A US08625891 US62589196A US5804252A US 5804252 A US5804252 A US 5804252A US 08625891 US08625891 US 08625891 US 62589196 A US62589196 A US 62589196A US 5804252 A US5804252 A US 5804252A
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group
substrate
groups
film
surface
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US08625891
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Kazufumi Ogawa
Mamoru Soga
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Panasonic Corp
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Panasonic Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61NELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00Electrotherapy; Circuits therefor
    • A61N1/18Applying electric currents by contact electrodes
    • A61N1/32Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362Heart stimulators
    • A61N1/365Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/36514Heart stimulators controlled by a physiological parameter, e.g. heart potential controlled by a physiological quantity other than heart potential, e.g. blood pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00Processes for applying liquids or other fluent materials
    • B05D1/18Processes for applying liquids or other fluent materials performed by dipping
    • B05D1/185Processes for applying liquids or other fluent materials performed by dipping applying monomolecular layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00Manufacture or treatment of nanostructures
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; MISCELLANEOUS COMPOSITIONS; MISCELLANEOUS APPLICATIONS OF MATERIALS
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D4/00Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/643Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain
    • D06M15/657Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain containing fluorine
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M23/00Treatment of fibres, threads, yarns, fabrics or fibrous goods made from such materials, characterised by the process
    • D06M23/005Applying monomolecular films on textile products like fibres, threads or fabrics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00Stock material or miscellaneous articles
    • Y10S428/913Material designed to be responsive to temperature, light, moisture
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2918Rod, strand, filament or fiber including free carbon or carbide or therewith [not as steel]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2933Coated or with bond, impregnation or core
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/29Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913Rod, strand, filament or fiber
    • Y10T428/2933Coated or with bond, impregnation or core
    • Y10T428/2962Silane, silicone or siloxane in coating
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31652Of asbestos
    • Y10T428/31663As siloxane, silicone or silane

Abstract

A durable and extremely water- and oil repellent ultra thin film is formed on the surface of a substates such as glass, ceramics, fabrics, fur and cloth by a dehydrochlorination reaction between a functional group such as a hydroxyl group or an imino group on the surface of the substrate. The coating film of the material comprises a plurality of chlorosilyl groups was formed on the surface of the substrate by dipping and holding the substrate comprising functional groups on its surface in a solution prepared by dissolving a material comprising fluorocarbon groups and a plurality of chlorosilyl groups in a non-aqueous solvent and drying the substrate which is then taken out from the solution in a substantially moistureless or low moisture atomosphere and removing the non-aqueous solvent remaining on the substrate. Further, when the coating film is left in an atomosphere comprising moisture, i.e., humid air, the coating film is polymerized by a dehydrochlorination reaction between the coating film and the moisture in the atomosphere. The film is formed on the surface of the substrate containing hydroxyl groups, imino groups or carboxyl groups through --SiO-- bonds or --SiN< bonds.

Description

This application is a division of Ser. No. 08/309,545, filed Sep. 20, 1994, now U.S. Pat. No. 5,571,662 which is a continuation of Ser. No. 07/914,533, filed Jul. 17, 1992, now abandoned.

FIELD OF THE PRESENT INVENTION

This invention relates to a method of making the surface of a substrate water- and oil repellent. More particularly, this invention relates to a method of making the surface of substrates, such as metal, ceramics, glass, plastic, fiber and paper, water- and oil repellent by forming a water- and oil repellent ultra thin film on the surface of the substrates.

Further, this invention relates to water- and oil repellent materials for apparel. Particularly, this invention relates to efficient water- and oil repellent and antifouling materials for apparel such as rainwear, coats, sportwear (for example ski wear), cloth for gloves, fur and leather.

BACKGROUND OF THE INVENTION

In the prior art, the surface of the materials such as metal, ceramics, glass, plastic, fiber, paper and wood were made water- and oil repellent by impregnating or coating resins and paints or by applying or baking an emulsion of a fluorocarbon resin such as polytetrafluoroethylene. In addition, making rainwear, coats, sportwear (including ski wear), cloth for gloves, fur and leather water- and oil repellent is an important object for antifouling materials for apparel and for rainy weather measures.

In the prior art, a method of spraying a fluorocarbon based emulsion (fluorocarbon resin) and forming a loose coating film having minute holes was proposed to make materials for apparel such as textiles with keeping air permeability to some extent. Another method of coating resins such as with a thin urethane resin to form a loose coating film having minute holes was proposed. Another method of densely weaving thin fiber having a relatively high shrinkage percentage and shrinking the textiles by a high temperature processing is also known. Further, a natural fur such as mink is polish processed by applying materials comprising a silicon compound or a fluorine compound.

However, in the prior art, the coated film was not chemically bonded to the surface of the substrate, thus it was a serious drawback that the durablity of the coated film was extremely poor. In addition, there was a problem that the appearance of the substrate was damaged by the prior art methods. In addition, the prior method of coating water repellent materials had only a minor effect on the substrate, thus the durability of the coating was extremely poor. The body also gets sweaty when wearing clothes whose surface was coated with resin. It is an extremely important improvement in material for apparel that only the surface fiber is made water repellent without damaging the luster of the fiber and the comfortable feeling of textiles and air permeability of the fiber is maintained.

SUMMARY OF THE INVENTION

It is a primary object of this invention to provide a method of making the surface of substrates, such as metal, ceramics, glass, plastic, fiber, paper and wood, water- and oil repellent by covering the surface of the substrates with an extremely durable ultra thin film.

It is the another object of this invention to provide water- and oil repellent materials for apparel which are durable and the body does not get sweaty in wearing clothes made of the materials for apparel.

According to a first aspect of the invention we provide a water- and oil repellent substrate comprising a chemically adsorbed polymer film as a surface layer covalently bonded to the substrate by --Si-- bonds, said chemically adsorbed film containing numerous water- and oil repellent functional groups.

It is preferable in this invention that the water- and oil repellent functional groups are fluorocarbon chain groups, and the covalent bonds are siloxane bonds.

It is preferable in this invention that the substrate is made of a material selected from the group consisting of fibers, metals, ceramics, glass, plastics, and papers.

It is preferable in this invention that the substrate is a fiber for apparel material.

According to a second aspect of the invention we provide a water- and oil repellent substrate treatment comprising dipping and holding a substrate comprising at least one functional group at its surface selected from the group consisting of a hydroxyl group, an imino group, and a carboxyl group in a solution prepared by dissolving a surface active material comprising a fluorocarbon and a chlorosilyl group in a non-aqueous solvent, and drying the substrate taken out of the solution in a substantially moistureless atomosphere and removing the non-aqueous solvent from the substrate.

It is preferable in this invention that the surface active material containing fluorocarbon and chlorosilyl groups is CF3 --(CF2)n --R--SiXp Cl3-p (where n represents 0 or an integer, R represents an alkyl group or a substituted group comprising a silicon atom or an oxygen atom or chemical bond, X represents H or a substituted group selected from the group consisting of an alkyl group and an alkoxyl group, and p represents 0, 1 or 2.).

It is preferable in this invention that the non-aqueous solvent is selected from the group consisting of a hydrocarbon-based organic solvent and a fluorocarbon-based organic solvent.

It is preferable in this invention that the active hydrogen group at the material surface is at least one functional group selected from the group consisting of a hydroxyl group, a carboxyl group, an imino group and an amino group.

It is preferable in this invention that surface functional group is a hydroxyl group provided by a plasma or corona treatment.

According to the invention, a durable, water- and oil repellent material for apparel can be provided by forming an extremely water- and oil repellent ultra thin film on the surface of the substrate via covalent bonds at a lower cost.

According to the invention, an extremely durable water- and oil repellent treatment was made easily by forming an extremely water- and oil repellent ultra thin film on the surface of the material via chemical bonds.

Subsequently, the water- and oil repellent treatment of the materials for apparel will be described with concrete examples.

A coating film of material containing at least one chlorosilyl group was formed on its surface of the substrate as follows:

by dipping and holding a material for apparel comprising a hydroxyl group, an imino group or a carboxyl group on its surface in a solution prepared by dissolving a material having a fluorocarbon group and at least one chlorosilyl groups resolved in a non-aqueous solvent;

by drying the substrate which is taken out from the solution in an atomosphere containing substantially no moisture and removing the non-aqueous solvent remaining on the substrate. Further, when the coating film was left in air, the coating film was polymerized by a dehydrochlorination reaction between the coating film and moisture in the air. Then, the coating film was bonded to the surface of the materials for apparel via covalent bonds. Thus, an extremely water- and oil repellent ultra thin film comprising numerous fluorine groups was formed on the surface of the materials for apparel via chemical bonds.

BRIEF DESCRIPTION OF DRAWINGS

FIGS. 1(a) to (c) show a cross section explaining the water- and oil repellent treatment of a substrate as in Example 1 and Example 3 of the invention.

FIGS. 2(a) to (c) show a cross section explaining the water- and oil repellent treatment of a substrate as in Example 2 and Example 4 of the invention.

DETAILED DESCRIPTION OF THE INVENTION

According to the invention, a durable and extremely water- and oil repellent ultra thin film is formed on the surface of substates such as glass, ceramics, fabrics, fur and cloth by a dehydrochlorination reaction between functional groups such as hydroxyl groups or imino groups on the surface of the substrate. The coating film of the material comprising a plurality of chlorosilyl groups was formed on the surface of the polymer film by dipping and holding the substrate comprising the functional groups on its surface in a solution prepared by dissolving a material comprising a fluorocarbon group and a plurality of chlorosily groups in a non-aqueous solvent and drying the substrate which is then taken out of the solution in a substantially moistureless atomosphere and removing the unreacted non-aqueous solvent remaining on the substrate. Further, when the coating film is left in an atomosphere comprising moisture, the coating film is polymerized by a dehydrochlorination reaction between the coating film and moisture in the atomosphere. The polymerized coating film contains numerous fluorine groups and reacts to moisture in the air. The substitute surface contains numerous hydroxyl groups, imino groups or carboxyl groups and thus the film is formed at the surface of the substrate through --SiO-- bond or --SiN< bond.

According to the invention, a method of making the surface of the substrate water- and oil repellent comprises steps as follows:

dipping and holding a substrate, whose surface has at least one functional group such as a hydroxyl group, an imino group and a carboxyl group, in a non-aqueous solution containing a material having a fluorocarbon group and a plurality of chlorosilyl groups,

drying the substrate which is taken out of the solution in a substantially moistureless or low moisture atomosphere and removing the unreacted non-aqueous solvent remaining on the substrate,

removing the substrate covered by the material having a fluorocarbon group and a plurality of chlorosilyl groups in an atomosphere comprising moisture (i.e., a humid atomosphere).

In the invention, it is preferable to use CF3 --(CF2)n --R--SiXp Cl3-p (where n represents 0 or an integer, R represents a substituted group comprising an alkyl group or a silicon atom or an oxgen atom or chemical bond) as a material having a fluorocarbon group and a pluraity of chlorosilyl groups.

In the invention, it is preferable to use a hydrocarbon based solvent or a fluorocarbon based solvent as a non-aqueous solvent.

According to the invention, a durable water- and oil repellent treatment can be provided by forming an ultra thin film comprising numerous, extremely water- and oil repellent fluorines via chemical bonds. Therefore, a coating film whose surface monomolecular film comprised a plurality of chlorosilyl groups was formed by dipping and holding a substrate whose surface comprised a hydroxyl group or an imino group or a carboxyl group in a non-aqueous solution containing a material having fluorocarbon groups and a plurality of chlorosilyl groups, taking the substate out of the solution, and removing the unreacted non-aqueous solution remaining on the substrate by drying in a substantially moistureless or low moisture atomosphere. Further, the coating film was polymerized by a dehydrochlorination reaction between the moisture in the air by exposing to an atmosphere containing moisture (i.e., humid air). Then an extremely water- and oil repellent ultra thin polymer film was formed on the surface of the substrate via chemical bonds as a dehydrochlorination reaction was also brought about between the coating film and the surface of the substrate.

CF3 (CF2)7 (CH2)2 SiCl3,

CF3 (CF2)5 (CH2)2 SiCl3,

CF3 CH2 O(CH2)15 SiCl3,

CF3 (CH2)2 Si(CH3)2 (CH2)15 SiCl3,

F(CF2)4 (CH2)2 Si(CH3)2 (CH2)9 SiCl3,

CF3 COO(CH2)15 SiCl3 are available as a material comprising a fluorocarbon group and a plurality of chlorosilyl groups.

It is preferable to use a hydrocarbon based solvent or a hydrogen fluoride based solvent as a non-aqueous solvent as they are not substantially toxic.

According to the invention, a water- and oil repellent material for apparel has an ultra thin film comprising numerous water- and oil repellent functional groups formed on the surface of the material via covalent bonds containing --Si-- bonds.

According to the invention, it is preferable that a functional group of the water- and oil repellent is a fluorocarbon group and the covalent bonds are siloxane bonds.

According to the invention, a durable water- and oil repellent material for apparel can be provided by forming an ultra thin film containing numerous water- and oil repellent functional groups via covalent bonds having --Si-- groups on the surface of the material. Further, as an ultra thin film at the nanometer level was formed on the surface of the material, the ultra thin film does not substantially prevent breathability and a body does not get sweaty in wearing clothes made of the substrate above mentioned.

According to a preferred embodiment of the invention, the water- and oil repellent fucntional group is fluorine and the covalent bond is a siloxane bond. A durable, water- and oil repellent material for apparel can be provided by forming an ultra thin film comprising numerous, extremely water- and oil repellent fluorine groups on the surface of the material via chemical bonds.

Subsequently, a detailed description of the invention will be described with concrete examples.

EXAMPLE 1

A coating film 2, being about 200 angstroms in thickness and comprising fluorocarbon groups and a plurality of chlorosilane groups, was formed as follows:

washing a processed glass substrate (any substrate such as metal, ceramics, plastic and fabrics comprising a functional group on its surface to bring about a dehydrochlorination reaction between the functional group and the chlorosilane group such as a hydroxyl group or an imino group or a carboxyl group are available) with pure water,

dipping and holding the substrate in a solution prepared by dissolving 1% by weight of a chemical compound comprising fluorocarbon groups and a plurality of chlorosilane groups, e.g., CF3 --(CF2)n --R--SiXp Cl3-p (where n represents 0 or an integer, R represents an alkyl group or a substituted group comprising a silicon atom or an oxygen atom or a chemical bond, X represents H or a substituted group such as an alkyl group or an alkoxyl group and p represents 0, 1 or 2.), e.g., CF3 (CF2)7 (CH2)7 (CH2)2 SiCl3, in a fluorocarbon based solvent e.g. (Afluid: Asahi glass Co.,) for about ten minutes.

drying the unreacted solvent remaining on the substrate in a substantially moistureless or low moisture atomosphere (preferably less than about 5% relative humidity) without washing with an organic solvent. When the coating film 2 was formed, a material comprising some fluorocarbon groups and a chlorosilane group was fixed on the surface of the substrate via siloxane bonds which was brought about by a dehydrochlorination reaction between the material above mentioned and a hydroxyl group 3 on the surface of the substrate (FIG. 1(b)). Then, when the substrate was left in an atomosphere comprising moisture (i.e., a humid atmosphere of more than about 30% of relative humidity such as air), the coating film and the unreacted chlorosilyl groups of the material having the fixed fluorocarbon groups and chlorosilane groups were polymerized by a dehydrochlorination reaction between moisture in the air. The coating film contained numerous fluorine groups and it was bonded to the surface of the substrate via siloxane bonds 4. Hence, an extremely water- and oil repellent ultra thin polymerized film 5 was formed on the surface of the substrate (FIG. 1(c)).

Further, the ultra thin polymer film was covalently bonded to the substrate via siloxane bonds, and was inseparable by scraping and washing the substrate. A wetting angle to water of the substrate was about 150°.

EXAMPLE 2

A coating film 12, being about 100 angstroms in thickness and comprising fluorocarbon groups and a plurality of chlorosilane groups, was formed as follows:

washing processed nylon-ABS resin substrate (polymer alloy or polymer blend) with pure water,

dipping and holding the substrate in a solution prepared by dissolving 1% by weight of a material having fluorocarbon groups and a plurality of chlorosilyl groups e.g. CF3 (CF2)5 (CH2)2 SiCl3 in a hydrocarbon based solvent (n-hexane) for about twenty minutes,

evaporating the unreacted solvent remaining on the substrate and drying the substrate in a substantially moistureless or low moisture atomosphre (preferably less than about 5% relative humidity) without washing with an organic solvent. When the coating film 12 was formed, a material comprising some fluorocarbon groups and the chlorosilane groups was fixed on the surface of the substrate via siloxane bonds which was made by a dehydrochlorination reaction between the material above mentioned and an imino group 13 on the surface of the substrate (FIG. 2(b)). Then, when the substrate was left in an atomosphere comprising moisture, i.e., a humid atomosphere such as air, the coating film above mentioned and the unreacted chlorosilyl groups of the material comprising the fixed florocarbon groups and chlorosilane groups were polymerized by a dehydrochlorination reaction with the moisture in the air. The coating film above mentioned contains numerous fluorine groups and was bonded to the surface of the substrate via --SiN< bonds. Hence, an extremely water- and oil repellent ultra thin polymerized film 15 was formed on the surface of the substrate (FIG. 2(c)).

Further, the ultra thin film was covalently bonded to the substrate via --SiN< bonds and was inseparable by scraping and washing the substrate. A wetting angle of the substrate to water was extremely high, 130°.

In the example above mentioned, CF3 (CF2)7 (CH2)2 SiCl3, and CF3 (CF2)5 (CH2)2 SiCl3 were used as a material comprising a fluorocarbon group and a chlorosilane group and CF3 CH2 O(CH2)15 SiCl3, CF3 (CH2)2 Si(CH3)2 (CH2)9 SiCl3, CF3 COO(CH2)15 SiCl3 were also available.

In additon, the substrate whose surface was roughened about 10-0.1 μm was used in Example 1 and Example 2 and in that case, a water-repellent angle of the substrate was about 160° or 150°.

EXAMPLE 3

Processed cotton fabrics for a rain coat or any fabrics such as fur or leather comprising a functional group on its surface which brings about a dehydrochlorination reaction between a chlorosilane group such as a hydroxyl group, an imino group and a carboxyl group was washed with pure water and dipped and held in a solution prepared by dissolving a material having fluorocarbon groups and a plurality of chlorosilane groups shown as follows: CF3 --(CF2)n --R--SiXp Cl3-p (where n represents 0 or an integer, R represents an alkyl group or a substituted group comprising a silicon atom or an oxgen atom or a chemical bond, X represents H or a substituted group such as an alkyl group or an alkoxyl group, and p represents 0, 1 or 2.) The material above mentioned was diluted with a non-aqueous solvent.

CF3 (CF2)7 (CH2)2 SiCl3 was used as an example of a chemical compound as shown above. Coating film 2, being about 200 angstroms (20 nm) in thickness and comprising an unreacted fluorocarbon group and a plurality of chlorosilane groups remaining on the surface of the cotton fiber of the fabric 1 was formed as follows:

dipping and holding a cotton fabric, for about ten minutes, in a solution prepared by dissolving 1% by weight of the chemical compound above mentioned in a fluorocarbon based solvent (for example, Afluid: Asahi glass Co.,)

drying the solvent of the fabric in a substantially moistureless or low moisture atomosphere (preferably less than about 5% relative humidity) without washing with an organic solvent. When the coating film 2 was formed on the cotton fiber surface, a material comprising some fluorocarbon groups and a chlorosilane group was fixed on the surface of the cotton fiber via siloxane bonds which was brought by a dehydrochlorination reaction between the hydroxyl groups on the surface of the cotton fiber 3 (FIG. 1(b)). Then, when the cotton fabric above mentioned was left in an atomosphere containing moisture such as humid air (preferably more than about 30% relative humidity), an unreacted chlorosilyl group of the material comprising the coating film with the fixed fluorocarbon groups and chlorosilane groups on the surface of the cotton fiber, the film was polymerized by a dehydrochlorination reaction between moisture in the air. The coating film above mentioned contained numerous fluorine groups and was bonded to the surface of the cotton fiber via siloxane bonds 4. Thus, an extremely water- and oil repellent ultra thin polymerized film 5 was formed on the surface of the cotton fabric (FIG. 1(c)).

When a cotton fabric was dipped and held in a solution prepared by dissolving an equal ratio of CF3 (CF2)7 (CH2)2 SiCl3 and pyridine (any alkali which does not react with a chlorosilyl group and contains no moisture is available) in a fluorocarbon based solvent, a coating film was formed without deteriorating the cotton fabric. By adding a great deal of pyridine, hydrochloric acid which was formed during the reaction was neutralized. Thus, the cotton fabric was not deteriorated.

The ultra thin film above mentioned comprising a fluorocarbon group was covalently bonded to the cotton fiber via siloxane bonds, and was inseparable by scraping and washing the substrate. A wetting angle to water of water- and oil repellent cotton fabric substrate was about 170°.

EXAMPLE 4

A coating film 12, being about 100 angstroms (10 nm) in thickness and comprising fluorocarbon groups and a plurality of chlorisilyl groups was formed as follows:

washing processed nylon fabric with pure water,

dipping and holding the nylon fabric in a solution, for about twenty minutes, prepared by dissolving 1% by weight of a material comprising fluorocarbon groups and a plurality of chlorosilyl groups such as CF3 (CF2)5 (CH2)2 SiCl3 in a hydrocarbon based solvent (normal hexane).

drying the substrate in a substantially moistureless or low moisture atomosphere (preferably less than about 5% relative humidity) without washing with an organic solvent. When the coating film 12 was formed, a material comprising some fluorocarbon groups and a chlorosilyl group was fixed on the surface of the nylon fiber via siloxane bonds (--SiO--) 14 which was brought about by a dehydrochlorination reaction between an imino group on the surface of the nylon fiber (FIG. 2(b)). Then, when the fabric was left in an atomosphere comprising moisture such as humid air (more than about 30% relative humidity), unreacted chlorsilyl groups of the material comprising the coating film, the fixed the fluorocarbon groups and the chlorosilane groups was polymerized by a dehydrochlorination reaction between moisture in the air. The coating film above mentioned contained numerous fluorocarbon groups and was bonded to the fiber of the substrate via --SiN< bonds. Hence, an extremely water- and oil repellent ultra thin polymerized film 15 was formed on the surface of the nylon fiber (FIG. 2(c)).

Further, the ultra thin film was covalently bonded to a nylon fiber via --SiN< bonds, and was inseparable by scraping and washing the substrate. A wetting angle to water of nylon cloth which was made of nylon fabrics was extremely high, about 170°.

In the example of the invention, CF3 (CF2)7 (CH2)2 SiCl3, CF3 (CF2)5 (CH2)2 SiCl3 was used as a material comprising a fluorocarbon group and a chlorosilane group. However, material shown as follows were also available.

CF3 CH2 O(CH2)15 SiCl3,

CF3 (CH2)2 Si(CH3)2 (CH2)15 SiCl3,

F(CF2)4 (CH2)2 Si(CH3)2 (CH2)9 SiCl3,

CF3 COO(CH2)15 SiCl3

As has been shown, the invention is greatly beneficial to industry.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims (4)

We claim:
1. A treatment method for rendering a substrate water-and oil repellent comprising
(i) dipping and holding a substrate selected from the group consisting of metal, ceramics, glass, plastic, fiber, paper, fabrics, fur and cloth in a solution prepared by dissolving a material comprising a fluorocarbon and a chlorosilyl group in a non-aqueous solvent, wherein a surface of the substrate comprises at least one functional group selected from the group consisting of a hydroxyl group, an imino group, an amino group and a carboxyl group,
(ii) taking said substrate out of said solution and drying said substrate in a substantially moistureless atmosphere, and
(iii) removing said non-aqueous solvent from said substrate.
2. The treatment method according to claim 1, wherein said material containing fluorocarbon and chlorosilyl groups is CF3 --(CF2)n --R--SiXp Cl3-p, where n represents 0 or an integer, R represents an alkyl group or a substituted group comprising a silicon atom or an oxygen atom or chemical bond, X represents H or a substituted group selected from the group consisting of an alkyl group and an alkoxyl group, and p represents 0, 1 or 2.
3. The treatment method according to claim 1, wherein said non-aqueous solvent is selected from the group consisting of a hydrocarbon-based organic solvent, and a fluorocarbon-based organic solvent.
4. The treatment method according to claim 1, wherein said functional group is a hydroxyl group provided by a plasma or corona treatment.
US08625891 1991-07-26 1996-04-01 Water- and oil repellent substrate and method of treatment Expired - Lifetime US5804252A (en)

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US08309545 US5571622A (en) 1991-07-26 1994-09-20 Water- and oil repellent substrate and method of treatment
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DE69227806D1 (en) 1999-01-21 grant
US5571622A (en) 1996-11-05 grant
EP0672779A3 (en) 1996-08-28 application
DE69227806T2 (en) 1999-04-29 grant
EP0525598B1 (en) 1998-12-09 grant
EP0672779A2 (en) 1995-09-20 application
EP0525598A1 (en) 1993-02-03 application

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